IB · IB Chemistry

IB Chemistry: From models to materials — Practice Questions & Answers

410 practice questions available for this topic — here are 10 with full answers and explanations.

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Practice questions with answers

1 Multiple choice · Easy

An alloy is best described as:

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WhyAn alloy is a homogeneous mixture of a metal with one or more other elements (usually metals).
2 Multiple choice · Medium

On the bonding triangle, a binary compound with a large electronegativity difference between its elements is classified as:

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WhyA large electronegativity difference places a compound towards the ionic corner of the bonding triangle.
3 Multiple choice · Medium

What is the name of the addition polymer formed from ethene?

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WhyMany ethene ($\text{C}_{2}\text{H}_{4}$) monomers join by addition polymerisation to form poly(ethene).
4 Multiple choice · Medium

Why are alloys generally harder than the pure metals they are made from?

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WhyAtoms of different sizes disrupt the regular layers of cations, making it harder for the layers to slide over each other, so the alloy is harder.
5 Multiple choice · Medium

On the bonding triangle, two elements with similar and high electronegativities form a bond that is mainly:

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WhySimilar, high electronegativities mean electrons are shared roughly equally, placing the bond in the covalent region.
6 Multiple choice · Hard

A compound has a small electronegativity difference but a low average electronegativity. Where does it sit on the bonding triangle?

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WhyLow average electronegativity with a small difference indicates metallic bonding (e.g. an alloy of two similar metals), the bottom-left corner of the triangle.
7 Fill in the blank · Easy

The small repeating molecule from which a polymer is built is called a .

Answer: monomer / monomers

WhyA polymer is a long chain made by joining many small units called monomers.
8 Fill in the blank · Medium

Poly(ethene) is formed from ethene by polymerisation, in which monomers join with no other product.

Answer: addition

WhyIn addition polymerisation, monomers containing C=C double bonds add together to form a polymer with no small molecule released.
9 Multiple choice · Medium

Of Mg, Ca, Sr and Ba, which has the strongest metallic bonding?

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WhyMagnesium has the smallest 2+ ion, so the attraction between its ions and the delocalized electrons is strongest.
10 Multiple choice · Medium

Metallic bonding is the attraction between positive ions and what?

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WhyMetallic bonding is the attraction between metal cations and a sea of delocalized electrons.

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Practise other IB Chemistry topics

Topic S1.1 (SL/HL): Introduction to the particulate nature of matter Topic S1.2 (SL/HL): The nuclear atom Topic S1.2 (HL): The nuclear atom Topic S1.3 (SL/HL): Electron configurations Topic S1.3 (HL): Electron configurations Topic S1.4 (SL/HL): Counting particles by mass: the mole Topic S1.5 (SL/HL): Ideal gases Topic S2.1 (SL/HL): The ionic model Topic S2.1 (HL): The ionic model Topic S2.2 (SL/HL): The covalent model Topic S2.2 (HL): The covalent model Topic S2.3 (SL/HL): The metallic model Topic S2.3 (HL): The metallic model Topic S2.4 (HL): From models to materials Topic S3.1 (SL/HL): The periodic table: classification of elements Topic S3.1 (HL): The periodic table: classification of elements Topic S3.2 (SL/HL): Functional groups: classification of organic compounds Topic S3.2 (HL): Functional groups: classification of organic compounds Topic R1.1 (SL/HL): Measuring enthalpy changes Topic R1.2 (SL/HL): Energy cycles in reactions Topic R1.2 (HL): Energy cycles in reactions Topic R1.3 (SL/HL): Energy from fuels Topic R1.4 (HL): Entropy and spontaneity Topic R2.1 (SL/HL): How much? The amount of chemical change Topic R2.2 (SL/HL): How fast? The rate of chemical change Topic R2.2 (HL): How fast? The rate of chemical change Topic R2.3 (SL/HL): How far? The extent of chemical change Topic R2.3 (HL): How far? The extent of chemical change Topic R3.1 (SL/HL): Proton transfer reactions Topic R3.1 (HL): Proton transfer reactions Topic R3.2 (SL/HL): Electron transfer reactions Topic R3.2 (HL): Electron transfer reactions Topic R3.3 (SL/HL): Electron sharing reactions Topic R3.4 (SL/HL): Electron-pair sharing reactions Topic R3.4 (HL): Electron-pair sharing reactions